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LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
OpenSCAD - OpenSCAD is a software for creating solid 3D CAD objects.
FreeCAD - An open-source parametric 3D modeler
SketchUp - 3D for Everyone
Autodesk AutoCAD - Autodesk AutoCAD is a commercial computer-aided design (CAD) and drafting software application.
QCAD - QCAD is an application for computer aided drafting in 2D.